Experimental Investigations On Creep Behavior Of Bedding Anisotropy Greenschist

In order to study the time-dependent deformation behavior of bedding anisotropy greenschist of Jin-ping II Hydropower Station, uniaxial and biaxial compression creep experiments were carried out. Vertical loadings were perpendicular or parallel to bedding planes, which were graded 4 classes. Lateral loadings in biaxial experiments were equal to half vertical loadings. The data of experiments were put forward by different strain-time curves, the relationship between both instantaneous elastic modulus and steady-state creep rate and stress level was established by employing exponential function. The results show that both bedding anisotropy and lateral pressure have strong control on the development of instantaneous strain and steady-state creep strain. In biaxial creep compression experiment, bedding anisotropy had greater effect on instantaneous elastic modulus and less effect on steady-state creep rate. But in uniaxial creep compression experiment, bedding anisotropy had greater effect both on instantaneous elastic modulus and steady-state creep rate.